Running Docker for Windows, Error when exposing Ports

Question

I am aware there are a lot of questions about running Docker on windows, however this question is about running the brand new Docker for Windows, on Windows.
In my case I am

Answer 1

This is caused by a port numbering conflict: github issue here https://github.com/docker/compose/issues/3277

Essentially the port is in use! The reason resetting worked is because it wiped other mappings off.